<!DOCTYPE html>
<html>

<head>
    <meta charset="UTF-8" />
    <title>04-实现两栏布局</title>
    <style>
        .left {
            width: 200px;
            height: 600px;
            background-color: yellowgreen;
            float: left;
        }

        .right {
            background-color: tomato;
            height: 600px;
            margin-left: 200px;
        }

        .inner {
            width: 300px;
            height: 200px;
            background-color: orange;
        }
    </style>
</head>

<body>
    <div class="box">
        <div class="left"></div>
        <div class="right">
            <div class="inner"></div>
        </div>
    </div>
</body>

</html>